An ideal monatomic gas expands to twice its volume. If the process is isothermal, the magnitude of work done by the gas is `W_(1)`. If the process is adiabatic, the magnitude of work done by the gas is `W_(a)` . Which of the following is true ?
A. `W_(i) = W_(a) gt 0`
B. `W_(i) gt W_(a) = 0`
C. `W_(i) gt W_(a) gt 0`
D. `W_(i) gt W_(a) gt 0`